West Bengal Institute of Technology (WBIT) 2010-6th Sem B.Tech Computer Science and Engineering Computer Science - Computer Graphics & Multimedia - Question Paper
Name:
Rail No.:...............................................................
Invigilator's Signature:..............................................
CS/B.Tech (CSE)/SEM-6/CS-603/2010 2010
COMPUTER GRAPHICS AND MULTIMEDIA
Time Allotted : 3 Hours Full Marks : 70
The figures in the margin indicate full marks.
Candidates are required to give their answers in their own words
as far as practicable.
GROUP - A ( Multiple Choice Type Questions)
1. Choose the correct alternatives for any ten of the following :
10 x 1 = 10
1} If blue Is represented as 001 the yellow is represented
' as ' . .
a) 001 b) 010
c) 101 d) 110.
ii) A 24-bit plane colour frame buffer with three 10-bit
wide colour look up tables can have ............... number
of colours. j
a) 2 24 b) 28
c) 248 d) 2 30.
iii) DAC means
a) direct access coding
b) digitally activated compression
c) direct area clipping
d) digital to analog converter. *
iv) ............................. acts as anode in CRT.
a) The phosphorous coating
. s '
b) The glass panel
c) The deflectors
d) None of these.
v) Slope of the line joining the points (1,2) and (3,4) is a) 0 b) 1
c) 2 d) 3.
vi) In Bresenhams circle generating algorithms, if ( x, y) is the current pixel position then the x-value of the next pixel position is
a) x b) x- 1
c) x + 1 d) x + 2.
vii) Run length coding is used for
0 image smoothening b) image compression c) image colouring d) image dithering.
viii) If X L, X R, Y g, Y T represent the four parameter of x-left, x-right, y-bottom and y-top of the clipping window and ( x, y j is a point inside the window then
a) Xl x<XRand Y B< y < Yt 1
b) XL<x<XR and YB>y>YT
c) X L>. x> X R and Y B< y < YT
d) XL > x> XR and Yg > y > YT .
ix) A line with end point codes as 0000 and 0000 is
a) partially invisible b) completely visible c) trivially visible d) completely invisible.
3d Which device is used to grasp a 'virtual object' ?
a) Space ball b) Data glove
c) Digitizer d) Touch panels.
xi) How many channels are specified by MIDI standard ?
a) 16 b) 24
c) 32 d) None of these.
xii) Lossy image simplification is based on ..................
operation,
a) DCT b) ccrr
c) ISO d) DMS.
GROUP-B.....
( Short Answer Type Questions )
Answer any three of the following. 3x5=15
2. Write the properties of B-spline. In what respect it differs from Bezier curve ? 3 + 2
3. Write boundaiy-fill algorithm for region filling. Compare and contrast the boundaiy-fill algorithm and flood fill algorithm.
; . . ' . 3 + 2
4. Explain Liang-Barsky algorithm for line clipping.
5. What do you mean by MIDI ? Write down the components of MIDI. 2 + 3
6. Define projection and mention its importance. Derive the transformation matrix for a perspective projection. 3 + 2
GROUP -C ( Long Answer Type Questions )
Answer any three of the following. 3 x 15 = 45
7. a) Derive Mid point circle drawing algorithm.
b) Using Mid point circle drawing algorithm draw a circle with radius 10 unit.
c) Define random and raster scanning. 7 + 5 + 3
8. a) Derive the transformation matrix for rotation about any
" -axis.' . ' - . , : . :
b) Explain the reflection of a>2D figure on y = mx + c. Derive Its component matrix.
c) What Is homogeneous co-ordinate ? Why is a homogeneous co-ordinate system needed in transformation matrix ? 5 + 7 + 3
9. a) Derive the transformation matrix for perspective
projection.
b) Suppose a window has its lowest left line comer at ( - 3, - 2 ) and its upper right comer at ( 4. 2 ). Find the visible portion of the line joining points ( - 4, 2 ) and ( 3, 5 ) using Cohen Sutherland line clipping
. algorithm.
c) Write and explain Sutherland-Hodgeman algorithm to clip a polygon. 5+6 + 4
10. a) Define morphing and masking.
b) Write down the basic step of JPEG.
c) What do you mean by key frame and tweening ?
d) Write few audio file formats. Explain the advantages and disadvantages of MIDI over digital audio.
2 + 2 + 5 + 2+1 + 3
11. Write short notes on any three of the following : 3x5
a) MPEG
b) Shading model
c) Virtual reality
d) Cohen Sutherland line clipping algorithm
e) CRT.
6201 4
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